Introduction to the Fourth Edition
- In memory of J. E. Alouf (1929–2014)
Section I: Basic Genomic and Physiological Aspects of Bacterial Protein Toxins
1. Evolutionary aspects of toxin-producing bacteria
- Introduction
- Molecular ecology of toxin-producing bacteria
- Toxins encoded by plasmids, bacteriophages, and other pathogenicity islands
- PAI-encoded toxins delivered by specialized secretion systems
- Molecular evolution of toxins through genetic exchange
- Modular recombination of bacterial toxins
- Conclusion
- References
2. Mobile genetic elements and pathogenicity islands encoding bacterial toxins
- Introduction: The genome structure of prokaryotes
- Protein toxins encoded by mobile genetic elements
- Gram-negative bacteria
- Gram-positive bacteria
- Protein toxins encoded by bacteriophages
- Gram-negative bacteria
- Gram-positive bacteria
- Protein toxin genes and other mobile genetic elements
- Toxins encoded by PAIs
- PAI-encoded toxins
- Other Gram-negative bacteria
- The bacterial T6SS
- Gram-positive bacteria
- Instability of PAIs
- Conclusion
- HGT and the evolution of toxin families
- Acknowledgments
- References
3. News and views on protein secretion systems
- Introduction
- Type I secretion system
- Type II secretion system
- Type III secretion system
- References
Section II: Intracellularly Alive Bacterial Protein Toxins
4. Diphtheria toxin
- Introduction
- Diphtheria toxin: from pathology to crystal structure
- The mechanism of action of DT
- Conclusion
- Acknowledgments
- References
5. Pseudomonas aeruginosa toxins
- Introduction
- T3 secretion in P. aeruginosa
- Discussion
- Conclusion
- References
6. Bordetella protein toxins
- PTX
- Adenylate cyclase toxin
- DNT
- References
7. Vibrio cholerae and Escherichia coli heat-labile enterotoxins and beyond
- Introduction
- Cholera then and now
- Traveler’s diarrhea and other related diseases
- Structure of cholera toxin and related enterotoxins
- Intestinal receptors of the enterotoxins
- How cholera toxin and E. coli heat-labile enterotoxin mediate diarrhea
- Toxin gene organization, regulation, and biogenesis
- Cholera toxin and co-regulated pilus (TCP), and ETEC homologues
- Conclusion
- References
8. Vibrio parahaemolyticus virulence determinants
- Introduction
- V. parahaemolyticus
- V. parahaemolyticus pandemic O3:K6 clone
- Virulence factors associated with V. parahaemolyticus pathogenicity in mammals
- Polar flagellum and surface sensing
- Quorum sensing
- Adhesins
- Capsule
- MSHA pilus
- MAM7
- TDH and TRH toxins
- T3SS
- T3SS1
- VopQ
- VopS
- VPA0450
- VopR
- T3SS2
- VopL
- VopA
- VopC
- VopT
- VopV
- VopZ
- VPA1380
- T6SS
- T6SS1
- T6SS2
- Development of mammalian models for the study of V. parahaemolyticus pathogenicity
- Parahaemolyticus as a shrimp pathogen
- Summary and conclusions
- References
9. Typhoid toxin
- Introduction
- Discovery of typhoid toxin
- Structure of typhoid toxin
- Typhoid toxin secretion and export from mammalian cells
- Typhoid toxin and typhoid fever
- Typhoid toxin and S. typhi host specificity
- Concluding remarks
- References
10. Shiga toxins: properties and action on cells
- Introduction
- Shiga toxins and the bacteria that produce them
- Detection of Shiga toxins
- Binding of toxins to cell surface receptors
- Endocytic uptake of Shiga toxin
- Transport of Shiga toxin between endosomes and the Golgi apparatus
- Retrograde Shiga toxin transport to the ER and translocation of the A chain to the cytosol
- Transport of Shiga toxin across epithelial cells
- Induction of cytokine production
- Toxin-induced apoptosis
- Protection against Shiga toxins
- Exploitation of Shiga toxins in medicine
- Conclusions
- Acknowledgments
- References
11. Clostridial neurotoxins: from the cellular and molecular mode of action to their therapeutic use
- Introduction
- Various botulinum neurotoxin-producing Clostridium species
- BoNT and botulinum toxin complexes
- Clostridium tetani, TeNT gene organization, and TeNT
- Mode of action of clostridial neurotoxins
- BoNT-induced muscle paralysis triggers sprouting and differentiation of new endplates
- Botulinum toxin and neurotoxin in therapy
- Toxin formulations and units
- From pioneering studies to approved indications
- Concluding remarks
- References
12. Uptake and transport of clostridial neurotoxins
- Introduction
- Mechanism of action
- Structure-Function relationship
- Neurospecific binding and uptake of CNT
- APRs as CNT binding sites
- Polysialoangliosides as cell surface receptors for CNTs
- Future perspectives
- Acknowledgments
- References
13. Bacillus anthracis toxins
- Introduction
- The genetics of toxin and virulence
- The proteins
- Toxin action on cells and animals
- Concluding remarks
- References
14. ADP-ribosylating toxins modifying the actin cytoskeleton
- Introduction
- Actin cytoskeleton and regulation of actin polymerization
- ADP-ribosylating toxins targeting RHO-GTPases
- ADP-ribosylating toxins targeting actin
- Salmonella SpvB
- Concluding remarks
- References
15. Large clostridial cytotoxins modifying small GTpases: structural aspects
- Introduction
- Binding of the toxins to target cells: the C-terminal CROP domain
- Pore formation and translocation of the toxins
- CPD
- The N-terminal glycosyltransferase domain
- Mechanism of the toxin-catalyzed glycosylation reaction
- Substrate recognition
- Holotoxin structure of TcdA and TcdB
- Conclusions
- References
16. Large clostridial glycosylating toxins modifying small GTPases: cellular aspects
- Introduction
- Cell entry
- Activities of the glycosyltransferase domain: UDP-hexose hydrolysis and glycosyltransferase activities
- Biological effects of the LCGTs in cell culture models
- Large clostridial glycosylating toxins in pathogenesis
- Treatment of CDAD and new approaches of LCGT inhibition
- Exploiting the large clostridial glycosylating toxins as tools in cell biology
- References
17. Pasteurella multocida toxin
- Introduction
- Molecular and cellular mechanisms of PMT action
- PMT activation of heterotrimeric G proteins and their effectors
- PMT-induced activation of Gαi
- PMT-stimulated Gβγ signaling
- Cellular effects of PMT
- PMT characterization
- PMT production and release
- PMT protein purification and characterization
- PMT structure and functional organization
- Localization of functional domains
- PMT crystal structure
- Comparison of PMT with related toxins
- PMT interaction with and entry into mammalian cells
- Cellular uptake
- Translocation into the cytoplasm
- Conclusion
- Acknowledgments
- References
18. Deamidase toxins
- Introduction
- The growing family of deamidase toxins and activating Rho GTPases
- Host cell reaction to Rho GTPase activation
- Acknowledgments
- References
19. Helicobacter pylori vacuolating toxin
- Introduction
- The vacA gene and its product
- VacA structure
- Interaction with host cells
- Biological activities of VacA
- Conclusion
- Acknowledgments
- References
20. Bacterial genotoxins
- Introduction
- CDT gene organization and distribution
- CDT structure and enzymatic activity
- Secretion from the producing bacterium
- Cellular internalization in the target cells
- Cellular responses to intoxication
- CDTs and bacterial pathogenesis
- CDTs as tools in basic and medical research
- Colibactin
- Concluding remarks
- Acknowledgments
- References
Section III: Bacterial Protein Toxins Active on the Surface of Target Cells
21. Basic mechanism of pore-forming toxins
- Introduction
- Structure of PFTs
- PFTs formed by α-helices
- Conclusions and further perspectives
- References
22. Membrane-damaging and cytotoxic sphingomyelinases and phospholipases
- Introduction
- Bacterial SMases
- Bacterial PLases
- Complementary or redundant roles of PLases and SMases in pathogenesis of selected diseases
- Concluding remarks
- References
23. Structure and function of RTX toxins
- Introduction: an overview of RTX proteins
- Common features of RTX toxins
- RTX-repeats: motifs and structures
- T1SS
- Assembly of the T1SS apparatus
- Main RTX toxins
- E. coli α-hemolysin (HlyA)
- Other RTX toxins
- The AC toxin, CyaA, from Bordetella species
- MARTX toxins
- Molecular mode of action of RTX toxins: some key issues
- Concluding remarks
- Acknowledgments
- References
24. Perfringolysin O and related cholesterol-dependent cytolysins: mechanism of pore formation
- Introduction to CDC family
- General features of the CDC structure and brief overview of the pore-forming mechanism
- Detailed pore-forming mechanism
- Amino-terminal extensions to the core CDC structure
- Cellular mechanisms of membrane repair after CDC attack
- CDCs in gram-negative bacteria
- Conclusion
- Acknowledgments
- References
25. The staphylococcal alpha-toxin and leukotoxins
- Introduction
- Alpha-helix cytolysins: delta-hemolysin and phenol-soluble modulins
- A beta-barrel pore formingtoxin prototype: alpha hemolysin
- Staphylococcal bicomponent leukotoxins
- Staphylococcal pore-forming toxins challenged in pathogenesis
- Applications and engineered PFTS in perspective
- Conclusion
- References
26. Aerolysin and Related Aeromonas Toxins
- Introduction
- Production, purification, and primary sequence
- Structure of proaerolysin
- Secretion of proaerolysin
- Receptor binding
- From the precursor to the active toxin
- Heptamer formation
- Membrane insertion and channel properties
- Cellular consequences of aerolysin
- Aerolysin as a tool
- Concluding remarks
- Acknowledgments
- References
27. Structural relationships between small β-pore-forming toxins from Clostridium perfringens
- Introduction
- βPFTs
- C. perfringens toxins
- Aerolysin-like toxins
- C. septicum α-toxin
- Shared mechanisms of cytotoxicity
- CPE
- Pore formation in aerolysin-like toxins
- Hemolysin-like toxins
- β-Toxin
- Relationship between C. perfringens and S. aureus hemolysin-like β-PFTs
- Conclusion
- Acknowledgments
- References
28. Clostridium perfringens enterotoxin
- Introduction
- The genetics and expression of CPE
- The intestinal action of CPE
- The cellular action of CPE
- Summary: a current model for CPE action
- CPE structure/function relationships
- Development of a CPE vaccine?
- Potential applications of CPE: cancer and more
- Concluding remarks
- Acknowledgments
- References
29. Bacillus cereus phospholipases, enterotoxins, and other hemolysins
- Introduction
- Toxins of B. cereus s.l.
- Regulation of transcription and secretion of toxins
- Conclusion
- References
30. Mechanism of action of Bacillus thuringiensis insecticidal toxins and their use in the control of insect pests
- Introduction
- Cry toxin family
- Cyt toxin family
- Vip toxin family
- Mechanism of action of 3d-Cry toxins
- Concluding remarks
- References
31. Escherichia coli heat-stable enterotoxins
- Introduction
- Diarrhea caused by ETEC
- Heat-stable enterotoxins
- STa enterotoxin
- Biochemical characteristics
- estA gene
- Secretion of STa and formation of disulfide bonds
- Structure of STa and identification of the toxic domain
- Receptors
- Receptor distribution
- Mechanism of action
- STa and TJs
- STb toxin
- Biochemical characteristics
- estB gene
- Secretion of STb and disulfide bond formation
- STb receptors
- Toxic domain and 3D structure of STb
- Mechanism of action
- Pore formation and internalization
- STb and TJs
- EAST1 toxin
- EAST1 polypeptide
- astA gene
- EAST1 variants
- EAST1 toxicity
- Relative importance of ETEC toxins in pathogenesis
- Concluding remarks
- Acknowledgments
- References
32. Bacterial superantigens and superantigen-like toxins
- Introduction
- Group a streptococcal superantigens
- Staphylococcal SAgs
- Protein structures of streptococcal and staphylococcal SAgs
- Biochemical properties of streptococcal and staphylococcal SAgs
- The SAgs of Yersinia pseudotuberculosis
- The SAg of Mycoplasma arthritidis
- Biological activities of SAgs
- SAgs and human disease
- Clinical and experimental therapeutic interventions
- Why do bacteria produce SAgs?
- The staphylococcal SAg-like toxins
- Acknowledgments
- References
Section IV: Clinical Aspects, Applications of Bacterial Protein Toxins in Cell Biology and Therapy, and Toxin Inhibitors
33. Clostridial toxins in the pathogenesis of gas gangrene
- Introduction
- Major histotoxic clostridial infections
- The role of exotoxins in C. perfringens gas gangrene
- Stage 4: Progression of local and regional tissue destruction
- Conclusion
- Acknowledgments
- References
34. Engineering of botulinum neurotoxins as novel therapeutic tools
- Background
- Strategy for successfully generating recombinant BoNTs as SCs in E. coli
- Insights gained into devising BoNT-based neurotherapeutics with long durations of action
- Engineering a long-acting antinociceptive by harnessing therapeutic advantageous features of two BoNT serotypes
- Engineered hybrids of BoNT and TeTx as tools to establish the domains responsible for their respective local or retrograde trafficking
- Retargeting of BoNT variants to selected secretory cells for additional therapeutic applications
- Concluding Remarks
- Acknowledgements
- References
35. Engineering of bacterial toxins for research and medicine
- Introduction
- Engineering receptor-binding activities
- Engineering toxin activation
- Exploiting membrane binding and translocation
- Engineering C domains
- Engineering of alpha toxin from Staphylococcus aureus
- Conclusion
- References
36. Toxins as tools
- Introduction
- Inactivation of Rho GTPases by bacterial protein toxins
- Rho-activating toxins
- ADP-ribosylating toxins to study actin
- Clostridial neurotoxins as tools to study exocytosis
- Toxins for intracellular protein delivery
- Conclusion
- References
37. Exploiting endocytic pathways to prevent bacterial toxin infection
- Introduction
- Mode of entry utilized by toxins
- CME
- IL-2 receptor endocytic pathway
- Toxins exploiting multiple entry mechanisms
- Lipid-binding toxins
- Synaptic vesicle recycling and toxin entry into neurons
- Toxins with undefined intra/extracellular pore-forming activity
- The availability of SMIs
- Inhibitors of clathrin and CME
- Other inhibitors of toxin endocytosis and trafficking
- Competitive inhibitors and antibodies (targeting the toxin)
- Development and testing of SMIs in the future
- Conclusion
- References
38. Inhibitors of pore-forming toxins
- Introduction
- Pore-forming bacterial toxins and their inhibitors
- Anthrax toxin of B. anthracis
- Clostridial binary toxin B subunits are close orthologs of the PA of anthrax
- Small-molecule cationic pore blockers
- Polyvalent cationic pore blockers
- Inhibiting staphylococcal membrane-perforating toxins
- Inhibiting ETX of C. perfringens
- Concluding remarks
- Acknowledgments
- References
39. Bacterial protein toxins as biological weapons
- Introduction
- The beginning of U.S. bioterrorism awareness
- Dual-use research of concern (DURC)
- Bacterial protein toxins as biological weapons
- BoNT as a bioweapon
- SEB as a bioweapon
- SEB diagnosis and treatment
- C. perfringens epsilon toxin
- Concluding remarks
- Disclaimer
- References